MAX1233_05 Datasheet, PDF (22/45 Pages) Maxim Integrated Products – ±15kV ESD-Protected Touch-Screen Controllers Include DAC and Keypad Controller

±15kV ESD-Protected Touch-Screen
Controllers Include DAC and Keypad Controller
Table 7. ADC Scan Select (Touch Screen, Battery, Auxiliary Channels, and Temperature)
A/D3 A/D2 A/D1 A/D0
FUNCTION
0
0
0
0 ^{Configures the ADC reference as selected by RES [1:0] bits as shown in Table 13. No measurement}
is performed.
0
0
0
1 Measures X/Y touch position and returns results to the X and Y data registers.
0
0
1
0
Measures X/Y touch position and Z1/ Z2 touch pressure and returns results to the X, Y, Z1, and Z2
data registers.
0
0
1
1 Measures X touch position and returns results to the X data register.
0
1
0
0 Measures Y touch position and returns results to the Y data register.
0
1
0
1 Measures Z1/Z2 touch pressure and returns results to the Z1 and Z2 data register.
0
1
1
0 Measures Battery Input 1 and returns results to the BAT1 data register.
0
1
1
1 Measures Battery Input 2 and returns results to the BAT2 data register.
1
0
0
0 Measures Auxiliary Input 1 and returns results to the AUX1 data register.
1
0
0
1 Measures Auxiliary Input 2 and returns results to the AUX2 data register.
1
0
1
0 Measures temperature (single ended) and returns results to the TEMP1 data register.
1
0
1
1 ^{Measures Battery Input 1, Battery Input 2, Auxiliary Input 1, Auxiliary Input 2, and temperature}
(differential), and returns results to the appropriate data registers.
1
1
0
0 Measures temperature (differential) and returns results to the TEMP1 and TEMP2 data registers.
1
1
0
1 Turns on Y+, Y- drivers. No measurement is performed.
1
1
1
0 Turns on X+, X- drivers. No measurement is performed.
1
1
1
1 Turns on Y+, X- drivers. No measurement is performed.
Table 8. ADC Resolution Control
RES1
RES0
ADC
RESOLUTION
INTERNALLY TIMED
REFERENCE POWER-UP
DELAY* (µs)
0
0
8 bit
31
0
1
8 bit
31
1
0
10 bit
37
1
1
12 bit
44
*Applicable only for temperature, battery, or auxiliary
measurements in auto power-up reference mode.
Table 9. ADC Averaging Control
AVG1
0
0
1
1
AVG0
0
1
0
1
FUNCTION
No data averages (default)
4 data averages
8 data averages
16 data averages
Table 10. ADC Conversion Rate Control
CNR1
0
0
1
1
CNR0
FUNCTION
0 ^{3.5µs/sample}
(1.5µs acquisition, 2µs conversion)
1 ^{3.5µs/sample}
(1.5µs acquisition, 2µs conversion)
0 ^{10µs/sample}
(5µs acquisition, 5µs conversion)
1
100µs/sample
(95µs acquisition, 5µs conversion)
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